Abstract: Advances in quantum theories of gravity in the last decade suggest that black holes could receive quantum corrections that can alter the near-horizon region, changing the predictions of General Relativity. In this talk, I will discuss black hole alternatives known as "fuzzballs", that appear in the well-developed quantum gravity formalism of string theory. I will discuss the theoretical status of fuzzball solutions and how they might (or might not) lead to smoking-gun signals such as gravitational wave echoes and more subtle features in gravitational wave signatures.

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